Custom CSS is not working

ERPNext
1

I just tried to override the CSS file but it doesn’t work. In that changes happen once, then changes cannot happen again.

hooks.py
app_include_css = "/assets/custom_app/css/custom.css"

custom.css in bench/apps/custom_app/custom_app/public/css

body {
    font-weight: 500;
}

build.json in bench/apps/custom_app/custom_app/public

{
    "css/custom.min.css": [
        "public/css/custom.css"
    ]
}